Floating chuck



Jan, 10, 1950 A. E. DRISSNER FLOATING CHUCK 2 Sheets-Shee 1 Filed Aug.3, 1945 INVENTOR A. E. DRISSNER FLOATING CHUCK Jam 10, 1%

2 Sheets-Sheet 2 Filed Aug. 5, 1945 Patented Jan. 10, 1956 FLOATINGCHUCK- Alfred E. Drissner, Cleveland, Ohio, assignor to i The NationalAcme Company, Cleveland, Ohio, a corporation of Ohio Application Augusta, 1945, Serial No. 608,795

2Claims. (01. 279-16) This invention relates to chucks, the object ofthe invention being to provide an improved chuck having a pair offloating jaws which can be used in place of two or three-jaw scrollchucks for gripping forgings or castings of any shape efiiciently andwith enormous pressure so as to hold the work securely in place andconcentric with the inside core so that the work can be effectivelymachined, and which chuck is simple in construction and comparativelyinexpensive to manufacture.

In the drawings accompanying and forming a part of this specification,Fig. 1 is a front view of this improved chuck.

Fig. 2 is a vertical sectional view thereof taken on line 2-2 of Fig. 1,and illustrating a piece of work gripped by the jaws.

Fig. 3 is a horizontal sectional view of the body of the chuck taken online 33 of Fig. 1.

Fig. 4 is what may be considered a plan view of the carrier or housingfor the cam.

Fig. 5 is a side view of Fig. 4.

Fig. 6 is a front end view of Fig. 4.

Fig. 7 is a detail view of the rocker arm and chuck jaw.

Fig. 8 is an end or front view of Fig. 7, and

Fig. 9 is a partly sectional view of the rotating cam.

Similar characters of reference indicate corresponding parts in theseveral views.

Before explaining in detail the present improvement and its mode ofoperation, I desire it understood that the present invention is notlimited to the details of construction and arrangement of partsillustrated in the accompanying drawings since the invention is capableof other embodiments and that the phraseology employed is for thepurpose of description and not of limitation.

This improved chuck comprises a body 2 adapted to be fastened to thespindle nose 3 in the usual manner and extends from the spindle nose tothe front end of the chuck and is provided with two deep slots 4 in eachof which a rocker arm 5 is pivoted by a bolt 6. This bolt not only actsas the pivotal means for the rocker arm but materially assists in addingreinforcement to the body in view of the deep slots necessary for therocker arms.

These slots open into a central bore 1 of the chuck. Each of the rockerarms is provided with a roller 8 on its inner end and a floating jaw 9at its opposite end to grip the work, the floating l0 which holds thegripping plate or jaw against the front face of its rocker arm 5.

' Each jaw 9 and its rocker arm is provided with cooperating inclinedback taper faces H and with a radius comprising convex and concavedcooperating faces l2 (see Fig. 8) formed in the present instance byconstructing the projecting lip I3 of the rocker arm as concaved and thetapered end of the jaw as convex although, obviously, this could bereversed.

This combined radius and back taper permits the gripping jaw to adjustitself readily to grip the hub or other outside diameter of the piece ofwork wherever it should happen to come, while the gripping face or teethof the jaw substantially conform to the radius.

Each rocker arm has a spring i3 and plunger 14 adapted to engage a spotor indentation i5 in the gripping jaw to hold the jaw in a central"positionwhen no work is applied to the chuck.

The taper of the gripping jaw will pull the jaw against the inner faceof the rocker arm during the gripping operation, thus insuring that thejaw hold very securely.

The rollers 8 of the rocker arms are in position to contact with arotating cam it having a pair of angular surfaces ll. This cam rotatesin the bore of a sliding housing l8 and has its bearing in the roundbore of this housing so that it can rotate freely.

This cam is provided with suitable bearings as, for instance, rollerbearings l9 which can be in one piece or with a plain bushing to takethe place of the roller bearings so long as it acts as a suitablebearing in the housing and permit its cam to rotate freely so that theangular surfaces will adjust themselves to the rollers of the rockerarms.

This housing may be operated by a draw rod 2i which can be operatedmechanically, hydraulically, or by air to pull the sliding housing withits rotatable cam in place against the rollers of the rocker arms. Thedraw rod 2! is reciprocally movable endwise, as indicated in Figure 2 toslide the hollow housing 58 and the cam I6 therewith.

As the cam can rotate in its housing or carrier, the contact of theangular surfaces il varies so that when the housing or carrier and itscam are pulled backward, the cam contacting the rollers of the rockerarms will spread the rollers apart and likewise the inner ends of therocker arms and apply an enormous pressure to the chucking jaws and thework so as jaw being pivoted to the rocker arm by a bolt to hold thework securely in place wherever the jaws happen to locate on the piececoncentric with the inside core and thus hold the work tightly duringthe machinin operation. It will be observed in the construction of thisimproved chuck, the cam means for operating the pivoted rocking armscooperates with the inner ends of the arms at the inner sides of thepivotal supports of the rocking arms on the body in other words, at theinner sides of the pivots '6.

In practice, suitable closing plates 22 and .23 are provided for thepurpose of keeping dust and dirt away from the chuck and fi'hin therocker arms and cam. y g

It is to be understood that hyd'es'cribing in detail herein anyparticular form, structure or arrangement, it is not intended to limitthe invention beyond the terms of the several-claims"or the requirementsof the prior art.

Having thus explained the nature of my said invention and described away of constructing and using the same, "although without attempting toset forth all "of "the forms in which it "may be made or all -of themodes of it's 'iise, I claim:

1. Ac'hu'ck for holding a workpiece, said chuck comprising a supportin'body, ro'c'ker arms car- Yiedby said body and each having an'inner endand an outer end a hollow housing -slidable within "Said supporting bodyand having slots "in 30 the wall thereof through which the inner ends"or the rocker arm's extend, a cam fr'ee1y'rotatable said housing andhaving barn surf'ac'e's 'hga'geable with the inner ends of therej'speotiverocker arms, and'iheans for "sliding the hbnow housing andthe cam therewith to'sepa; rate the inner ends. of the rocker arms andthereby grip a workpiec'epdsitioneubetween the "outer "ends "oftherocker arms, V

2. A chuck fonholding aworkpiecesam'chuek resort;

comprising, a supporting body, rocker arms carried by said body and eachhaving an inner end and an outer end, a roller on each of said innerends, a hollow housing slidable within said supporting body and havingslots in the wall thereof through which the inner ends of the rockerarms extend, a cam having angular cam surfaces --engageab-1e by therollers on the inner ends of the respective rocker arms, bearing meansrotatabiy supporting said cam in said housing "whereby the angular camsurfaces of the cam adjust themselves with the rollers on the rockerarms, and means for sliding the hollow housing and the cam therewith toseparate the inner ends ofthefrockfi arms and thereby grip a workpiecepositioned between the outer ends of the dobker arms.

ALFRED E. DRISSNER.

REFERENCES CITED The following references are- 0f record in the file ofthis patenlt:

UNITED STAT-ES PATENTS Number "Name Date "9,2"22 Sloan Aug. 24,1852

23351139 Stephens Dec. '14, 18280 30 26 'Ami'don Sept. 16,1834

398,481 vvllililley 26, 1389 FOREIGN PAT-EN'ES Number

